Steam generator



w. A. MOFFAT.

STEAM GENERATOR.

APPLICATION FILED JUNE I, 1909.

1 ,1 95,064. Patented Aug. 15, 1916.

3 SHEETS-SHEET I.

W. A. MOFFAT.

STEAM GENERATOR.

APPLICATION FILED JUNE 1. I909.

1 1 95,064. Patented Aug. 15, 1916.

3 SHEETS-SHEET 2.

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W. A. MOFFAT.

STEAM GENERATOR.

APPLICATION HLED JUNE 1. 1909. 1,1 95,064. Patented Aug. 15, 1916.

3 SHEETSSHEET 3.

Wilt name UNITED STATES PATENT ornion.

WALTER A. MOFFAT, OF. DENVER, COLORADO,]ASSIGNOR TO THE IMPROVED BOILER FEED COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

, STEAM-GENERATOR.

Specification of Letters Patent.

Patented Aug. 15, 1916.

Application filed June 1, 1909. Serial No. 499,315.

To all whom it may concern Be it lmown that I, WALTER a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented new and useful Improvements in Steam-Generators, of which the following is a specification.

This invention relates to improvements in steam generators and has for its object to generate steam of a high temperature and to conduct it away in a dry state so as not to cause priming when it is introduced into the engine. v

Another object of-my invention is to store away the steam in a drum or reservoir and prevent the same condensing or losing its full heat efficiency.

It is also the purpose'of my invention to prevent the temperature of the boiler feed water from interfering with the lasting qualities of stored away steam, andfrom lowering its temperature andpressure. To this end an apparatus is provided which carries out a principle of generating steam which is compatible with the saving of fuel and conserving the thermal efficiency of the steam.

With the above and other objects in view my invention consists in the combination, arrangement and details of construction disclosed in the drawings and specifications and then more particularly pointed 'outin the appended claims.

Figure 1 is a top plan view of a mechanism or system of heaters and connecting means for effecting the invention. Fig. 2 is a front view partly in section of the valve shown in Fig. 1, and Fig. 3 is a sectional view on line 3-3 of Fig. 1. p 1

A preliminary heater A is provided, a hot water circulating heater B, a steam storage reservoir C, and as'team generating heater D. The heater A is a drum having a series of tubes through which a heating medium suchvas exhaust steam may be passed for heating the water contained in the drum and surrounding the tubes; I The feed-water or other fluid is supplied to the drum by means of apipe 1 leading from any source of sup ply. The exhaust steam' or other medium enters the drum through the pipe'2 and passes off therefrom by means of a pipe 3. A steam space is maintained at the upper portion of the drum andforthis purpose a drip or pipe l having a suitable valve, con- Morr'AT,

nects withthe upper portion thereof to act as an indicator when the heater is filled to the overflow line.

The hot water circulating heater B conslstsof a slow water heating boiler and furnace preferably of the water tube type, be-

'- ing set in masonry or brick work. A drum 6 is located at the top of the setting and above-the arch or crown of the furnace far removed from contact with the products of combustion. Aseries of tubes 7 are located in the combustion chamber of the furnace and are inclined to the horizontal and are connected at their ends to headers 8 and 9. A series of vertically disposed pipes 10 connect the header 8 with the front portion of the drum G and a corresponding series of upright tubes 11 connect" the header 9 with the rear portion'of said drum. The water circulates through the drum 6 and series of .pipes 7, lO-and 11. A pipe 12 connects the *steamspace of the heater A with the steam space'of the drum 6 and a pipe 13 connects thelower portion of the water space of the heater" A with the lower portion of the heater'space of the drum 6. .Each' of the pipes 12 and 13 is provided with controlling'valves for cutting off communication between the two heaters when required.-

1 Theheaters' or boilers D are of the flue or tubular type and as shown, comprise duplex boilers which are. in communication by means of pipes 14; and15, said pipes being provided with suitable controlling valves.

'The pipe 15 connects with the'steam spaces of the boilers D whereas the pipe 1 1 has connection withthe water spaces of the boilers D at a point just below the level of the water when at its-lowest pointh A reser voir or tankC constitutesa storage compartand receives the hot water or liquid from the heater B. p The lower portion of thetank or I with thepipe '15. A pipe 1'9servesto carry ofi' the'heated; steam from the boilers D to holes, pressure gages, safety valves and waterjgages for the usual and well known purposes. The steam spaces of the boilersD the engine or 'oth'er-required'point of'use.

JThe several heaters are provided with man.- "105 and storage reservoir, C are in communi cation by means of a pipe 18 and the water m'ent or container common to'both'boil'ersD tainer G is connected by'mea ns of axpipe 18' f connected by means of pipe 21, each having erating the same.

It will be especially observed the necessarv check and stop valve for opthat the furnace and boiler D are provided with flues in which the gases of combustion circulate. The water space incloses these fiues and the steam space is at the upper end of the water space. WVhen a fire is burning in this furnace, owing to the relatively large heating surface which the multiplicity of flues makes possible, the water will be quickly reduced to steam which is led directly into the steam reservoir C. The Water necessary to fill the boiler D is conducted thereinto by way of the steam storage reservoir itself,- 2'. 6.the water must pass from the drum 6 of the boiler B through a valve controlled pipe 21 into the lower end of the reservoir or receptacle C and when the valves connected to pipe 14 are open, this water is drawn into the boiler D until it reaehesa level where the lower ends of the steam draw-oft pipes 15 extend. There will .bea fire burning in heater B at the time the gaseous heating medium is passing into heater A to heat the feed water therein, and there will be a fire burning in heater B. The heated feed water is led initially out of heater A through pipe 13 intoheater B and after filling the circulating pipes 7 10 and 11 and the drum 6 can be led through pipe 21 into reservoir C and from the latter into heater D. It is preferred that the heating of the feed water in heater A lead the heating of the water in heater B and as the process of combustion in the furnaces B and D is being kept up, it will be seen that the formation of steam in heater B will lag behind the generation of steam in heater D. In heater B the hot'water isdesignedly kept at the highest temperature short of steam conversion and what little steam-is thus formed, in comparison with the steam generated in heater D is adapted to be led through the valve controlledpipe 20 to the upper end of the reservoir C. The disposition of the circulating pipes 7 10 and 11 is such that the products of combustion surrounding them will thoroughly heat these pipes and effect a circulation of hot water through these pipes and in the drum 6, the temperature being controlled so that on the point of, generating steam rapidly in the drum 6, the supply of hot water therein and in the pipes 7, 10 and 11 maybe replenished from the heater A, the feed water coming from heater A in a suiliciently heated condition to render rapid the consummation of temperature from drum 6 into the bottom of the storage reservoir C and thus into the water space of heater 10, this hot water falling from below the steam space line into the heater D. The high pressure stored steam in reservoir C contacting with this outflowing exceedingly hot water will undergo no condensation or loss of its thermal eificiency but on the other hand by keeping open the valve controlling the pipe 15, the steam in the steam space of heater D above the stream of hot water thus falling below the space may have the benefit of the steam pressure in reservoir C and thus the steam leaving the storage reservoir from its upper end through pipe 18 enables the steam to get in back of the hot water introduced into heater D and thus prevent this water losing its heat. Finally when enough of this hot water is introduced into the heater D, the valve controlling pipe 21 is closed and thus the steam will again completely fill the reservoir C and be stored therein, the hot temperature of the Water and the heated gases effecting its conversion into steam in a very short time, this steam expanding in the reservoir in .a dry state and in a more or less superheated condition. In this way there is no falling of temperature of the steam in the reservoir C when it does come in contact with the hot water and if any moisture affect the steam, the steam affected thereby will be kept in the steam space of heater D and so when the valve of pipe 18 is closed shortly after the valve controlling pipe 21 is closed the moistened steam will not reach reservoir C.

The arrangement is also such that by means of suitable safety automatic pressure controlling valves the steam in drum 6 may pass through pipe 12, operate its check valve and force water. from heater A to automatically enter the drum 6; this may be at the time that the exceedingly hot waterinheater B iscaused to replenish the supply of water in heater D. The fact that the water introduced into the hot water radiator or heater B is itself a heated condition will prevent the radiator B losing heat. Should steam be formed in heater A the same-can pass through pipe 12 into drum 6 and from the latter into the top of the reservoir C and be stored therein. Thus it will be seen that 'the storing of wet saturated steam in reservoir C is impeded and the steam trapped therein kept in a dry condition, the hot water in drum 6 being utilized before becoming steam, in assisting this process.

It will be seen that numerous modifications may be resorted to in practice without departing in principle from the details of construction set forth in the appended claims.

I claim 1. A steam generator consisting of a steam storage reservoir, a multiple flue boiler, pipes connecting the bottom of said storage reservoir and extending down into said multiple flue boiler below its steam space, a steam conveying pipe connecting the upper end of said boiler and the upper end of said storage reservoir, a second hot water circulating boiler, circulating pipes in said hot water circulating boiler, a drum to which said circulating pipes are connected, means for cutting off communication between the steam spaces in said multiple flue boiler and said reservoir, a valve controlled pipe leading from the lower end of said drum to the lower end of said reservoir, a

preliminary water heater extending above' said drum, a valve controlled pipe connecting the lower end of said preliminary heater and the lower end of said drum, and a valve controlled pipe connecting the upper end of said preliminary heater and the upper end of said drum.

2. In a device of the kind described, in combination a hot water circulating heater, a steam generating heater, a steam storage reservoir connected to said steam generating heater, means for passing hot water from said first named heater directly through said reservoir and into said steam generating heater, means for preheating feed water, and means for supplying said preheated feed water into said hot water circulating heater.

3. In a device of the kind described, in combination, a slow water heating boiler, a relatively quicker water heating boiler, said boilers being out of direct communication,

a Water preheater communicating with said 1 ducted into said reservoir into said second named boiler below its steam space.

In testimony whereof I affix my signature in presence of two witnesses.

WALTER A. MOFFAT.

WVitnesses:

JOHN L. FLETCHER, REXFORD M. SMITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, .D. C. 

